Appliance knob



FIG. 1 is a front perspective view of an appliance knob showing our new ornamental design;

FIG. 2 a front view thereof;

FIG. 3 is a top view thereof;

FIG. 4 is a bottom view thereof; and,

FIG. 5 is a left side view thereof, with the right side view thereof being a mirror image thereof.

The views of the appliance knob not shown (e.g., rear view), form no part of the claimed design. 

CLAIM The ornamental design for an appliance knob, as shown and described. 